536499 A7 B7 五、發明說明（1 ) 發明背景 … 本發明針對自行車鏈條的護板，特別是針對靠近自行 車的前撥鏈器安裝的護板，以防止鏈條從小鏈輪脫落，並 且可將前撥鏈器定位在車架上。 有些自行車配備有連接於前踏板的三個前鏈輪齒圈及 附著於自行車的後輪的多個後鏈輪。鏈條連接在所選定的 前鏈輪齒圈與所選定的後鏈輪之間，以便將來自踏板的驅 動力提供至後輪。使用前撥鏈器來將鏈條定位於所選定的 前鏈輪齒圈上，而使用後撥鏈器來將鏈條定位於所選定的 後鏈輪上。前後鏈輪的各種不同的組合提供寬廣範圍的齒 輪比來適應寬廣範圍的騎車條件。 如果前撥鏈器未被適當地調整，則當鏈條從中間鏈輪 齒圈向最小鏈輪齒圈移位時，就有鏈條從最小的鏈輪齒圈 脫落的危險。結果，鏈條經常塞在最小鏈輪與自行車車架 之間，因而需要騎車者拆卸自行車，以將鏈條重新附著於 鏈輪。因爲鏈條經常以很大的力塞在最小鏈輪與自行車車 架之間，所以使鏈條解脫可能非常困難。因此，有想要盡 可能防止此種塞住。 調整前撥鏈器包含適當地設定前撥鏈器在車座管上的 直立向位置。已發現這非常困難並且要花費許多時間，因 爲正確的操作經常需要非常緊的公差。結果，前撥鏈器經 常未被正確地定位。 發明槪說 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐）-4 - (請先閱讀背面之注意事項再填寫本頁) n n ί n n w IV e n n n ·1ϋ 1_1 ·11 n I -¾¾^ 經濟部智慧財產局員工消費合作社印製 536499 經濟部智慧財產局員工消費合作社印製 A7 B7 五、發明說明（2 ) 本發明針對在·外鏈輪齒圈與自行車車架之間安裝於自 行車車架的護板，以用來將前撥鏈器定位在自行車車架上 ，並且用來在鏈條從較大鏈輪向較小鏈輪移位時引導鏈條 ，以使得鏈條不會從較小鏈輪脫落。 在本發明的一實施例中，附著於自行車車架以用來引 導鏈條的護板包含支撐體，其具有橫向面朝自行車車架的 第一側；橫向背對自行車車架的第二側；下部；及上部。 支撐體的第一側的下部建構成與自行車的底部托架對齊， 而定位支座構件設置在支撐體的第一側的上部上。定位支 座構件的上表面形成用來將前撥鏈器定位於自行車車架的 定位支座。另外，可在支撐體的第二側的上部上形成鏈條 引導支座，以用來在鏈條從較大鏈輪齒圈移位到較小鏈輪 齒圈時引導鏈條。 在更特定的實施例中，定位支座構件形成用來將支撐 體定位在自行車車架上的車架定位構件，並且支撐體的下 部界定底部托架開口。鏈條引導支座具有弧形形狀，並且 設置於從水平軸線大約4 5 °到大約8 5 °的角度處，更 明確地說爲大約6 6 °的角度處。 圖式簡要敘述 圖1爲自行車車架的一部份的側視圖，在自行車車架 上安裝有前撥鏈器及根據本發明的護板的特別實施例； 圖2爲圖1所示的自行車車架，前撥鏈器，及護板的 後視圖； 本紙張义度適用中國國家標準（CNS)A4規格（210x 297公釐）-5- -------^------裝--- (請先閱讀背面之注意事項再填寫本頁) L訂-· 536499 A7 B7 五、發明説明（3 ) 圖3爲圖1及2所示的護板的右側視圖； 圖4爲圖1及2所示的護板的左側視圖； 圖5爲圖1及2所示的護板的後視圖； 圖6爲圖1及2所示的護板的前視圖； 圖7爲圖1及2所示的護板的頂視圖； 圖8爲顯示護板如何固定於自行車的底部托架的剖面 示意圖。 . 元件對照表 (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 1 0 白 行 車 車 架 1 4 、JT · 刖 撥 鏈 器 1 8 護 板 2 2 基 座 構 件 2 6 可 移 動 構 件 3 0 鏈 條 導 板 3 4 連 桿 機 構 3 8 鏈 條 4 2 小 鏈 輪 4 6 中 間 鏈 輪 5 0 大 鏈 輪 5 4 致 動 臂 5 8 底 部 托 架 6 0 板 體 6 4 第 側 本纸張尺度適用中國國家標準（CNS ) A4規格（210X297公釐）-6- 536499 A7 五、發明説明（4 ) 經濟部中央標隼局員工消費合作社印製 6 8 第 二 側 7 2 下 部 7 6 上 部 8 0 底 部 托 架 開 □ 8 4 車 架 疋位 構 件 8 8 定位 支 座 構 件 9 2 定 位 緩 衝 構 件 9 6 半 圓 形 凹 面 1 0 0 上 槽 1 0 4 上 表 面 1 0 8 下 槽 1 1 2 下 表 面 1 1 6 槽 1 2 0 半 圓 形 凹 面 1 4 0 直 軸 線 1 4 4 直 平 面 1 6 0 鏈 條 引 導 支 1 6 4 圓 周 1 6 8 橫 向 最 外 邊 1 7 0 水 平 軸 線 1 8 〇 下 凹 部 1 8 4 後 凹 部 1 9 0 緊 固 環 1 9 2 凸 緣 I----------- (請先閲讀背面之注意事項再填寫本頁) 訂 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 經濟部中央標準局員工消費合作社印製 536499 A7 B7 五、發明説明（5 ) 194 橫向內表面’ 19 5 橫向外表面 196 圓柱部份 19 7 槽 198 底部托架軸承裝配罩 199 內邊緣 2 〇 〇 凸緣 實施例的詳細敘述 圖1爲自行車車架1 0的一部份的側視圖，在自行車 車架1 0上安裝有前撥鏈器1 4及根據本發明的護板1 8 的特別實施例，而圖2爲圖1所示的自行車車架1 〇，前 撥鏈器1 4，及護板1 8的後視圖。前撥鏈器1 4包含用 來將前撥鏈器1 4安裝於自行車車架1 〇的基座構件2 2 ’支撐鏈條導板3 0的可移動構件2 6，及用來將可移動 構件2 6連接於基座構件2 2的連桿機構3 4，以使得鏈 條導板3 0可響應由撥鏈器鋼索（未顯示）施加於致動臂 5 4的張力來在小鏈輪4 2，中間鏈輪4 6，與大鏈輪 5 0之間引導鏈條3 8。 如果前撥鏈器1 4未被適當地調整，則當前撥鏈器 1 4將鏈條3 8從中間鏈輪4 6移位至小鏈輪4 2時，就 會有鏈條3 8從小鏈輪4 2脫落的危險。當此情況發生時 ’有時鏈條3 8會塞在小鏈輪4 2與車架1 0之間，尤其 是在小鏈輪4 2與底部托架5 8之間。爲防止此種情況發 本紙張尺度適用中國國家標準（CNS ) Α4祝格（210X 297公釐）-8 - — __ ί ^ •衣-I (請先閱讀背面之注意事項再填寫本頁) 訂 536499 A7 B7 經濟部中央標準局員工消費合作社印掣 五 、發明説明 ( 6 ) 1 | 生 將 護 板 1 8 在 小 鏈 輪 4 2 與 車 架 1 0 之 間 安 裝 於 車 架 1 1 J 1 0 ， 更 明 確 地 說 是 在 小 鏈 輪 4 2 與 底 部 托 架 5 8 之 間 0 1 1 如 圖 3 至 7 所示 j 護 板 1 8 包含 板 體 6 0 形 式 的 支 撐 ，^、 -it 1 體 而板 體 6 0 具 有 橫 向 面 朝 白 行 車 車 架 1 0 的 第 _. 側 先 閱 1 6 Μ 1 4 ， 橫 向 背 對 白 行車車 架 的 第 二 側 6 8 j 下 部 7 2 及 背 1 上 部 7 6 〇 板 體 6 0 可 由 塑 膠 玻 璃 纖 維 y 鋁 鋼 等 製 成 意 1 1 I 〇 此 處 所 用 的 術 語 厂 橫 向 面 朝 白 行 車 j 厂 橫 向 背 對 白 行 事 項 1 1 車 j 1 厂 上 j 及 厂 下 j 是 從 圖 2 決 定 j 而 術 語 厂 向 一、Λ- 刖 J 填 寫 本 # 厂 一Y/· 刖 方 J 厂 向 後 j 厂 後 方 j 是 從 圖 1 決定 其 中 向 頁 1 I 刖 或 前 方 方 向 是 朝 向 圖 1 的 右 側 j 而 向 後 或 後 方 方 向 是 朝 1 向 圖 1 的 左 側 〇 1 1 1 板 體 6 0 的 下 部 7 2 具 有 與 底 部 托 架 5 8 對 齊 的 底 部 I 訂 托 架 開 □ 8 0 〇 在 此 實 施 例 中 ， 底 部 托 架 開 □ 8 〇 的 直 徑 1 1 與 在 白 行 車 的 底 部 托 架 5 8 的 相 應 開 P ( 未 顯 示 ) 的 直 徑 1 | 相 同 〇 在 任 何 情 況下 j 當 護 板 1 8 安 裝 於 白 行 車車 架 1 0 1 I 時 5 板 體 6 0 的 下 部 7 2 的 第 一 側 6 4 與 底 部 托 架 5 8 對 纛 齊 Ο 1 1 車 架 定 位 構 件 8 4 設 置 在 板 體 7 6 的 第 一 側 6 4 的 上 1 部 7 6 上 y 用 來 將 板 體 7 6 定位在 白 行車車 架 1 〇 上 〇 在 1 I 此 實 施 例 中 J 如 圖 7 中 更 爲 淸 晰 地 可 見 y 定位 構 件 8 4 包 1 f 含定位支 座 構 件 8 8 及 定位 緩 衝 構 件 9 2 〇 定位支 座 構 件 1 1 8 8 與 板 體 6 〇 形 成 爲 單 件 y 並 且 相 對 於 第 一 側 6 4 以 直 1 1 角 橫 向 向 內 延 伸 〇 定位支 座 構 件 8 8 包含半 圓 形 凹 面 9 6 1 1 ， 沿 著 相 鄰 於 凹 面 9 6 的 上 表 面 1 0 4 延 伸 的 上 槽 1 0 0 1 1 1 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐）_ 9 - 536499 A7 B7 五、發明説明（7 ) ’以及沿著相鄰於凹面9 6的下表面1 1 2延伸的下槽 1 0 8。定位緩衝構件9 2包含用來將定位緩衝構件9 2 安裝於定位支座構件8 8的槽1 1 6，以及用來抵靠車架 1 0的半圓形凹面1 2 0。如此，凹面1 2 0將板體6 0 不可旋轉地定位在車架1 0上。定位緩衝構件9 2可由塑 膠或橡膠製成，以防止板體6 0刮壞車架1 0。 當板體6 0定位在自行車車架1.0上時，定位支座構 件8 8的上表面1 0 4可作用成爲定位支座，其抵靠前撥 鏈器1 4的基座構件2 2，以用來設定前撥鏈器1 4的正 確直立向高度。底部托架開口 8 0的中心與上表面1 〇 4 之間的距離可從4 5毫米到7 5毫米，其係根據所用的前 撥鏈器和鏈輪齒圈的種類。例如，當具有鋁基座構件2 2 的前撥鏈器與具有4 8齒的大鏈輪齒圈一起使用時，底部 托架開口 8 0的中心與上表面1 〇 4之間的距離應爲大約 71·5毫米。當具有鋼基座構件22的前撥鏈器與具有 4 2齒的大鏈輪齒圏一起使用時，底部托架開口 8 〇的中 心與上表面1 0 4之間的距離應爲大約4 7 · 8毫米。 經濟部中央標隼局員工消費合作社印製 如圖7所不’定位緩衝構件9 2的凹面1 2 〇 (或者 如果未使用定位緩衝構件9 2，則爲定位支座構件8 8的 凹面9 6 )的中心在與底部托架開口 8 0的中心（圖3 ) 相交的直立軸線1 4 0上。另外，凹面9 6及1 2 0相對 於從直立軸線1 4 0延伸至每個凹面的中心的直立平面 1 4 4爲對稱狀。此處所用的直立軸線通常與車座管一致 ，因而並非必然爲確實的鉛垂方向。 -10- (請先閲讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標隼（CNS ) A4規格（210X297公釐） 536499 Λ7 B7 五、發明說明（8 ) 鏈條引導支座1 6 0在板體6 0的第二側6 8的上部 7 6上與其形成爲單件，用來將鏈條3 8引導至小鏈輪 4 2，並且在鏈條3 8從中間鏈輪4 6向小鏈輪4 2移位 時防止鏈條3 8從小鏈輪4 2脫落。如圖1所示，鏈條引 導支座1 6 0定位在由小鏈輪4 2的齒所界定的圓周 1 6 4上方，並且如圖3所示，其具有以底部托架開口 8〇的中心爲中心的弧形形狀。在此實施例中，鏈條引導 支座1 6 0的徑向位置離開圓周1 6 4大約6 . 0毫米， 最好爲6·4毫米。並且，如圖3所示，支座160的橫 向最外邊緣1 6 8從垂直於直立軸線1 4 0且與底部托架 開口 8 0的中心相交的水平軸線1 7 0逆時針大約4 5 ° 延伸到大約8 5 ° 。鏈條引導支座1 6 0最好有一部份設 置在從水平軸線1 7 0逆時針至少大約6 6 °處。 下凹部1 8 0在鏈條引導支座1 6 0的下方形成在板 體6 0的第二側6 8上，並且大致依循小鏈輪4 2的齒的 路徑，如圖1所示。當鏈條3 8與小鏈輪4 2嚙合時，下 凹部1 8 0有助於防止鏈條3 8摩擦板體6 0。另外，後 凹部1 8 4設置成相鄰於鏈條導板支座1 6 0且在其後方 ，用來防止鏈條3 8摩擦板體6 0。在此實施例中，後凹 部1 8 4具有推拔形狀，其從鏈條引導支座1 6 0的後方 橫向向內傾斜至板體6 0的後邊緣，如圖了中較爲淸晰地 表示。 爲使用護板1 8，將板體6 0放置成使得定位緩衝構 本紙張尺度適用中國國家標準（CNS)A4規格（210 X 297公釐）-11 - (請先閱讀背面之注意事項再填寫本頁) * n n n_l 1-1 n n 一口，V n m 1_*536499 A7 B7 V. Description of the invention (1) Background of the invention ... The present invention is directed to the protective plate of a bicycle chain, especially to the protective plate installed near the front derailleur of a bicycle to prevent the chain from falling off the small sprocket, and the front dial The chain is positioned on the frame. Some bicycles are equipped with three front sprocket ring gears connected to the front pedal and multiple rear sprocket wheels attached to the bicycle's rear wheels. A chain is connected between the selected front sprocket ring gear and the selected rear sprocket to provide driving power from the pedals to the rear wheels. Use the front derailleur to position the chain on the selected front sprocket ring gear, and use the rear derailleur to position the chain on the selected rear sprocket. Various combinations of front and rear sprocket wheels provide a wide range of gear ratios to accommodate a wide range of riding conditions. If the front derailleur is not properly adjusted, there is a danger that the chain will fall off from the smallest sprocket ring gear when the chain is shifted from the intermediate sprocket ring gear to the smallest sprocket ring gear. As a result, the chain is often jammed between the smallest sprocket and the bicycle frame, requiring the cyclist to disassemble the bicycle to reattach the chain to the sprocket. Because the chain is often jammed between the smallest sprocket and the bicycle frame with great force, it can be very difficult to release the chain. Therefore, there is a desire to prevent such clogging as much as possible. Adjusting the front derailleur includes properly setting the upright position of the front derailleur on the seat tube. This has been found to be very difficult and takes a lot of time, as correct operation often requires very tight tolerances. As a result, the front derailleur is often not positioned correctly. The invention said that the paper size is applicable to the Chinese National Standard (CNS) A4 (210 X 297 mm) -4-(Please read the precautions on the back before filling this page) nn ί nnw IV ennn · 1ϋ 1_1 · 11 n I -¾¾ ^ Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 536499 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (2) The invention is directed to the installation between the outer ring gear ring and the bicycle frame Protective plate for bicycle frame for positioning the front derailleur on the bicycle frame and for guiding the chain when the chain is shifted from a larger sprocket to a smaller sprocket so that the chain does not move from the The smaller sprocket comes off. In an embodiment of the present invention, the guard plate attached to the bicycle frame for guiding the chain includes a support body having a first side laterally facing the bicycle frame and a second side laterally facing away from the bicycle frame; Lower part; and upper part. The lower part of the first side of the support body is aligned with the bottom bracket of the bicycle, and the positioning support member is disposed on the upper part of the first side of the support body. The upper surface of the positioning support member forms a positioning support for positioning the front derailleur on the bicycle frame. In addition, a chain guide support may be formed on the upper portion of the second side of the support body to guide the chain when the chain is shifted from the larger sprocket ring gear to the smaller sprocket ring gear. In a more specific embodiment, the positioning support member forms a frame positioning member for positioning a support body on a bicycle frame, and a lower portion of the support body defines a bottom bracket opening. The chain guide support has an arc shape and is provided at an angle of about 45 ° to about 85 ° from the horizontal axis, and more specifically at an angle of about 66 °. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a part of a bicycle frame. A front embodiment of a front derailleur and a guard plate according to the present invention is mounted on the bicycle frame. FIG. 2 is a bicycle shown in FIG. 1 Rear view of the frame, front derailleur, and guard plate; the meaning of this paper applies to the Chinese National Standard (CNS) A4 specification (210x 297 mm) -5- ------- ^ ----- -Install --- (Please read the precautions on the back before filling in this page) Order L-536536 A7 B7 V. Description of the invention (3) Figure 3 is a right side view of the shield shown in Figures 1 and 2; Figure 4 1 is a left side view of the shield shown in Figs. 1 and 2; Fig. 5 is a rear view of the shield shown in Figs. 1 and 2; Fig. 6 is a front view of the shield shown in Figs. 1 and 2; Top views of the guard plate shown in 1 and 2; FIG. 8 is a schematic cross-sectional view showing how the guard plate is fixed to the bottom bracket of the bicycle. Component comparison table (please read the precautions on the back before filling out this page) Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 1 0 White carriage frame 1 4 、 JT · derailleur 1 8 Guard plate 2 2 Base Component 2 6 Movable component 3 0 Chain guide 3 4 Link mechanism 3 8 Chain 4 2 Small sprocket 4 6 Intermediate sprocket 5 0 Large sprocket 5 4 Actuating arm 5 8 Bottom bracket 6 0 Plate body 6 4 The paper size on the first side applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -6- 536499 A7 V. Description of the invention (4) Printed by the Consumer Cooperatives of the Central Standardization Bureau of the Ministry of Economic Affairs 6 8 Second side 7 2 Lower part 7 6 Upper part 8 0 Bottom bracket opening 8 4 Frame positioning member 8 8 Positioning support member 9 2 Positioning buffer member 9 6 Semi-circular concave surface 1 0 0 Upper groove 1 0 4 Upper surface 1 0 8 Lower groove 1 1 2 Lower surface 1 1 6 Groove 1 2 0 Semi-circular concave surface 1 4 0 Straight axis 1 4 4 Straight plane 1 6 0 Chain guide support 1 6 4 Circumference 1 6 8 Horizontal outermost 1 7 0 Horizontal axis 1 8 〇Down recess 1 8 4 Rear recess 1 9 0 Fastening ring 1 9 2 Flange I ----------- (Please read first Note on the back, please fill in this page again.) The size of the paper used for this edition is in accordance with Chinese National Standard (CNS) A4 (210X297 mm). Printed by the Staff Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs. Surface '19 5 Lateral outer surface 196 Cylindrical portion 19 7 Slot 198 Bottom bracket bearing assembly cover 199 Inner edge 2000 flange Detailed description of the embodiment Figure 1 is a side view of a portion of a bicycle frame 10 A special embodiment of a front derailleur 14 and a protective plate 18 according to the present invention is mounted on the bicycle frame 10, and FIG. 2 is the bicycle frame 10 and the front derailleur 14 shown in FIG. , And rear view of the guard plate 18. The front derailleur 14 includes a base member 2 2 for mounting the front derailleur 14 to the bicycle frame 10, a movable member 26 for supporting the chain guide 30, and a movable member 26 2 6 A link mechanism 3 4 connected to the base member 2 2 so that the chain guide 30 can respond to the tension applied to the actuating arm 5 4 by a derailleur wire (not shown) to the small sprocket 4 2 , The middle sprocket 4 6 and the large sprocket 50 0 guide the chain 38. If the front derailleur 1 4 is not adjusted properly, the current derailleur 1 4 will shift the chain 3 8 from the middle sprocket 4 6 to the small sprocket 4 2, and there will be a chain 3 8 from the small sprocket 4 2Danger of falling off. When this happens ’Sometimes the chain 38 is jammed between the small sprocket 42 and the frame 10, especially between the small sprocket 42 and the bottom bracket 58. In order to prevent this situation, the paper size applies the Chinese National Standard (CNS) Α4 Zhuge (210X 297 mm) -8-— __ ί ^ • Yi-I (Please read the precautions on the back before filling this page) Order 536499 A7 B7 Printed by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of the Invention (6) 1 | Health guard 1 8 is installed on the frame 1 between the small sprocket 4 2 and the frame 1 0 J 1 0 More specifically, it is between the small sprocket 4 2 and the bottom bracket 5 8 0 1 1 As shown in FIGS. 3 to 7 j The guard plate 1 8 includes a support in the form of a plate body 60, ^, -it 1 body The plate body 60 has the first _. Side that faces the white carriage frame 10 first, reads 16 M 1 4 first, and faces away from the second side of the white carriage frame 6 8 j lower portion 7 2 and back 1 upper portion 7 6 〇The plate body 6 0 can be made of plastic glass fiber y aluminum steel etc. 1 1 I 〇The term used here is the factory horizontally facing the white traffic j The factory horizontally facing the white traffic 1 1 car j 1 The top j and the bottom j are determined from Figure 2 and the term factory to one, Λ- 刖 J to fill in this # Factory one Y / · 刖 Fang J factory backward j factory back j is determined from Figure 1 to page 1 I 刖Or the forward direction is toward the right side j in FIG. 1 and the backward or rear direction is toward the left side of FIG. 1 1 1 1 The lower part of the plate 6 0 7 has a bottom I aligned with the bottom bracket 5 8 □ 8 0 〇 In this embodiment, the diameter 1 1 of the bottom bracket opening □ 8 〇 is the same as the diameter 1 | of the corresponding opening P (not shown) of the bottom bracket 5 8 on the white carriage. In any case j When the guard plate 1 8 is mounted on the white carriage frame 1 0 1 I 5 The lower part of the plate body 6 0 7 The first side of the 6 6 is aligned with the bottom bracket 5 8 1 1 Frame positioning member 8 4 Setting The upper part 7 6 on the first side 6 4 of the plate body 7 6 is used to position the plate body 7 6 on a white carriage. 1 〇〇〇 1 1 In this embodiment, J is more clearly visible as shown in FIG. 7 y positioning member 8 4 package 1 f including positioning support member 8 8 and positioning buffer member 9 2 〇 positioning support member 1 1 8 8 is formed as a single piece y with the plate body 6 and extends laterally inward at a straight 1 1 angle with respect to the first side 6 4. The positioning support member 8 8 includes a semicircular concave surface 9 6 1 1 along the adjacent On the upper surface of the concave surface 9 6 1 0 4 Extending upper groove 1 0 0 1 1 1 This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) _ 9-536499 A7 B7 V. Description of the invention (7) 'And a lower groove 108 extending along the lower surface 1 1 2 adjacent to the concave surface 96. The positioning buffer member 92 includes a groove 1 1 6 for mounting the positioning buffer member 92 on the positioning support member 8 8 and a semicircular concave surface 1 2 0 for abutting against the frame 10. In this way, the concave surface 120 positions the plate body 60 on the frame 10 non-rotatably. The positioning buffer member 92 may be made of plastic or rubber to prevent the plate body 60 from scratching the frame 10. When the plate 60 is positioned on the bicycle frame 1.0, the upper surface 10 of the positioning support member 8 8 can function as a positioning support, which abuts against the base member 2 2 of the front derailleur 14 to Used to set the correct upright height of the front derailleur 14. The distance between the center of the bottom bracket opening 80 and the upper surface 104 can range from 45 mm to 75 mm, depending on the type of front derailleur and sprocket ring gear used. For example, when a front derailleur with an aluminum base member 22 is used with a large sprocket ring gear with 48 teeth, the distance between the center of the bottom bracket opening 80 and the upper surface 104 may be Approximately 71.5 mm. When a front derailleur having a steel base member 22 is used with a large sprocket with 4 2 teeth, the distance between the center of the bottom bracket opening 80 and the upper surface 10 4 should be approximately 4 7 8 mm. The consumer cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs printed the concave surface 1 2 of the positioning buffer member 9 2 as shown in FIG. 7 (or the concave surface 9 6 of the positioning support member 8 8 if the positioning buffer member 92 is not used). ) Is centered on the upright axis 1 40 that intersects the center of the bottom bracket opening 80 (Figure 3). The concave surfaces 96 and 12 are symmetrical with respect to the upright plane 1 4 4 extending from the upright axis 140 to the center of each of the concave surfaces. The upright axis used here usually coincides with the seat tube, so it is not necessarily a vertical direction. -10- (Please read the precautions on the back before filling this page) This paper size is applicable to China National Standard (CNS) A4 size (210X297 mm) 536499 Λ7 B7 V. Description of the invention (8) Chain guide support 1 6 0 is formed as a single piece on the upper part 7 6 of the second side 6 8 of the plate 6 0 to guide the chain 3 8 to the small sprocket 4 2, and at the chain 3 8 from the middle sprocket 4 6 to the small When the sprocket 4 2 is displaced, the chain 3 8 is prevented from falling off from the small sprocket 4 2. As shown in FIG. 1, the chain guide support 160 is positioned above the circumference 1 64 defined by the teeth of the small sprocket 42, and as shown in FIG. 3, it has a center with a bottom bracket opening 80. Centered arc shape. In this embodiment, the radial position of the chain guide support 160 is about 6.0 mm from the circumference 16 4 and preferably 6.4 mm. And, as shown in FIG. 3, the lateral outermost edge 1 6 8 of the support 160 is approximately 4 5 ° counterclockwise from a horizontal axis 1 70 that is perpendicular to the upright axis 1 4 0 and intersects the center of the bottom bracket opening 8 0 Extends to approximately 8 5 °. The chain guide support 160 is preferably partially disposed at least about 66 ° counterclockwise from the horizontal axis 170. The lower recessed portion 18 is formed on the second side 68 of the plate body 60 below the chain guide support 160, and substantially follows the path of the teeth of the small sprocket 42, as shown in FIG. When the chain 38 is engaged with the small sprocket 42, the recessed portion 180 helps prevent the chain 38 from rubbing against the plate body 60. In addition, the rear recessed portion 1 84 is disposed adjacent to and behind the chain guide plate support 160 to prevent the chain 38 from rubbing against the plate body 60. In this embodiment, the rear recess 1 84 has a push-out shape, which is inclined laterally inward from the rear of the chain guide support 160 to the rear edge of the plate 60, as shown more clearly in the figure. . In order to use the protective plate 18, the plate body 60 is placed so that the positioning buffer structure paper size applies to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) -11-(Please read the precautions on the back before filling This page) * nn n_l 1-1 nn, V nm 1_ *
經濟部智慧財產局員工消費合作社印制取 536499 A7 B7 五、發明説明（9 ) 件9 2的凹面1 2 〇抵靠車架1 〇，並且板體6 〇的第一 側6 4抵靠底部托架5 8，而使底部托架開口 8 0與在底 部托架5 8中的開口對齊。如圖8所示，包含具有橫向內 表面1 9 4的凸緣1 9 2，橫向外表面1 9 5，以及圓柱 部分1 9 6的緊固環1 9 0裝配於板體6 0，使得圓柱部 分1 9 6延伸通過底部托架開口8 〇，並且橫向內表面 1 9 4稍微裝配在第二側6 8的槽1. 9 7內。然後將具有 凸緣2 0 0的傳統的底部托架軸承裝配罩1 9 8旋入底部 托架5 8的開口中’以將板體6 0扣持於車架1 〇。緊固 環1 9 0的圓柱部分1 9 6的內邊緣1 9 9抵靠底部托架 5 8的邊緣，使得凸緣2 0 〇不會對板體6 0施加過量壓 力。然後，將前撥鏈器1 4固定於車架1 〇，而使基座構 件2 2的底部表面抵靠定位支座構件8 8的上表面1 0 4 。當鏈條3 8從中間鏈輪4 6向小鏈輪4 2移位時，如果 前撥鏈器1 4未被正確調整，則鏈條引導支座1 6 0防止 鏈條3 8從小鏈輪4 2脫落。 經濟部中央標準局員工消費合作社印製 (請先閱讀背面之注意事項再填寫本頁) 雖然以上敘述本發明的各種不同的實施例，但是在不 離開本發明的精神及範圍下可採用另外的修正。例如，可 如所想要的來改變各種不同構件的大小，形狀，位置，及 方向。一元件的功能可以由兩個元件來完成，反之亦然。 可省略定位緩衝構件9 2，並且底部托架開口 8 0可如所 想要的具有比在底部托架5 8中的開口大或小的直徑。定 位支座構件8 8與鏈條導板支座1 6 0不須與板體6 0形 成爲單件。因此，本發明的範圍不應受限於所揭示的特定 本紙張尺度適用中國國家標準（CNS ) A4祝格（2丨0'〆297公釐）-12 - 536499 A7 B7 五、發明説明（10 ) 結構。本發明的真正範圍應由申請專利範圍來界定。 經濟部中央標準局員工消費合作社印製 (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐）· 13 -Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 536499 A7 B7 V. Description of the invention (9) The concave surface of the piece 9 2 abuts against the frame 1 0 and the first side 6 4 of the plate 60 abuts against the bottom The bracket 58 is aligned so that the bottom bracket opening 80 is aligned with the opening in the bottom bracket 58. As shown in FIG. 8, a fastening ring 1 9 0 including a flange 1 9 2 having a lateral inner surface 1 9 4, a lateral outer surface 1 9 5, and a cylindrical portion 1 9 6 is assembled to the plate body 60 to make the cylinder Section 1 9 6 extends through the bottom bracket opening 8 0, and the lateral inner surface 1 9 4 fits slightly in the slot 1. 9 7 of the second side 68. Then, the conventional bottom bracket bearing assembly cover 198 with the flange 200 is screwed into the opening of the bottom bracket 58 to hold the plate 60 to the frame 10. The inner edge 199 of the cylindrical portion 19 of the fastening ring 190 abuts against the edge of the bottom bracket 5 8 so that the flange 200 will not exert excessive pressure on the plate body 60. Then, the front derailleur 14 is fixed to the frame 10, so that the bottom surface of the base member 22 is abutted against the upper surface 10 4 of the positioning support member 88. When the chain 3 8 is shifted from the middle sprocket 4 6 to the small sprocket 4 2, if the front derailleur 14 is not adjusted correctly, the chain guide support 1 6 0 prevents the chain 3 8 from falling off the small sprocket 4 2 . Printed by the Consumers' Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the notes on the back before filling out this page) Although the above describes various embodiments of the present invention, other ones can be used without departing from the spirit and scope of the present invention Amended. For example, the size, shape, position, and orientation of various components can be changed as desired. The function of one element can be performed by two elements and vice versa. The positioning buffer member 92 may be omitted, and the bottom bracket opening 80 may have a larger or smaller diameter than the opening in the bottom bracket 58 as desired. The positioning support member 88 and the chain guide support 160 need not be formed as a single piece with the plate body 60. Therefore, the scope of the present invention should not be limited to the specific paper size disclosed by the Chinese National Standard (CNS) A4 Zhuge (2 丨 0'〆297 mm) -12-536499 A7 B7 V. Description of the invention (10 ) Structure. The true scope of the invention should be defined by the scope of the patent application. Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs (Please read the notes on the back before filling out this page) This paper size applies to China National Standard (CNS) A4 (210X297 mm). 13-